78523900 has 72 divisors (see below), whose sum is σ = 209743520. Its totient is φ = 24848640.

The previous prime is 78523883. The next prime is 78523919. The reversal of 78523900 is 932587.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4786 + ... + 13414.

Almost surely, 2^78523900 is an apocalyptic number.

78523900 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78523900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104871760).

78523900 is an abundant number, since it is smaller than the sum of its proper divisors (131219620).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78523900 is a wasteful number, since it uses less digits than its factorization.

78523900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8663 (or 8656 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 78523900 is about 8861.3712257190. The cubic root of 78523900 is about 428.2203352079.

The spelling of 78523900 in words is "seventy-eight million, five hundred twenty-three thousand, nine hundred".